JPH02107081A - Edtv system - Google Patents

Abstract

PURPOSE: To display an extended definition television(EDTV) signal on an NTSC receiver with satisfactory vertical resolution by forming the EDTV signal having an image section and a lateral edge section respectively consisting of images having specified aspect ratios. CONSTITUTION: The EDTV signal having an image section 14 of an aspect ratio 16:9 and a lateral edge section 16 adjacent to that image while having the aspect ratio 4:3 of its entire image is formed, transmitted by an NTSC system and received by a standard NTSC receiver so as to be displayed as a 4:3 image satisfying the picture of aspect ratio 4:3 while including the 16:9 image and one lateral edge section at least. The receiver having a 16:9 screen horizontally and vertically enlarges the image of the received EDTV signal, forms an enlarged output signal corresponding to the enlarged image, and displays only the enlarged 16:9 image on the screen without the lateral edge section 16. Thus, the EDTV system capable of displaying the image high in vertical definition even on the NTSC receiver is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to extended definition television (EDTV) systems configured to be compatible with standard NTS[': systems, and in particular to The image can be displayed on an NTSC receiver with a high vertical resolution.

(Prior art) Conventional television receivers display images with an aspect ratio of 4:3, whereas the aspect ratio used in movies is 1:3.
6:9, and the industry has been working to develop a television transmission and reception system that is compatible with the 16:9 aspect ratio.

Furthermore, the conventional NTSC system uses interlaced scanning images.

(Problem to be Solved by the Invention) However, interlaced scanning has well-known drawbacks that have traditionally been applied to television systems such as high-definition television (EDTV) systems, and many HOTν signals are This type of television system, which can be applied to an NTSC television receiver, has not been able to display an NTSC television signal on an EDTV receiver.

(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned conventional problems and to
An object of the present invention is to provide an enlarged definition television system that is compatible with the TSC system and can display images with excellent vertical definition even on NTSC receivers.

In a preferred embodiment of the present invention, an extended definition television (EDTV) system forms a line-sequential scan CDTV signal that can be displayed on an NTSC television receiver, and the NTSC signal is displayed on an EDTV receiver. obtain. Also, in the preferred embodiment, line-sequential scanning E! O
A TV signal is displayed on an EDTV receiver with a vertical resolution superior to that of an NTSC signal displayed on an NTSC receiver.

The original image of this EDTV system is a line-sequential scanning image with an aspect ratio of 4:3, and has an image portion consisting of an image with an aspect ratio of 16:9 and a horizontal edge portion consisting of an image that satisfies the image with an aspect ratio of 4:3. have.

This original image is line-sequentially scanned using 480 scanning lines, that is, 360 scanning lines in the image portion and 120 scanning lines in the lateral edge portion, at a horizontal scanning rate of 26 microseconds per scanning line. On the other hand, a standard NTSC image is scanned with 240 scan lines at a horizontal scan rate of 52 microseconds per scan line. Therefore, this CDTV signal is
In order to make this method compatible with the TSC method, it is necessary to further process this original image.

That is, to transmit on a single NTSC channel, 2
forming and combining different signal components; The first signal component (2) is constituted by alternate selection of scanning lines of the original image, so to speak, vertical down-selection, and horizontal time axis expansion, so to speak, scan conversion. Component Q is constituted by line difference information formed by finding the difference between a certain scanning line and the average of two scanning lines adjacent to it on both sides. Therefore, this Q signal component is subjected to vertical down selection and scan conversion in the same way as the (2) signal component. These two signal components I and Q contain all the information obtained from the original image signal and are both compatible with the standard NTSC system;
The bandwidth is barely sufficient to transmit a single complete image.

To transmit extra information on a single NTSC channel,
A method is used in which the image carrier is modulated in-phase and in quadrature. That is, the (1) signal component is used to modulate the in-phase component of the image carrier in a manner similar to that used to conventionally modulate the NTSC carrier. Additionally, the image carrier has quadrature sidebands, which have a bandwidth of 1.2 MHz compared to the 4.2 MHz bandwidth of the in-phase component.
At 25 MHz L, only a portion of the Q signal component can modulate the quadrature sidebands.

Therefore, this Q signal component is low-pass filtered to about 1.25 MHz before being used for quadrature phase modulation of the image carrier. By subtracting this low-pass Q signal component from the original Q signal component, a high-pass Q signal component is obtained, but this high-pass Q signal component can be inserted into the edge region of the signal component. Can be done. However, in the edge area, there are only 1/3 as many scan lines per field as in the main image area, so it takes 3 field periods to fill the screen with the high-pass Q signal component. become. Also, there is no problem with static parts of the image, but with moving parts,
A motion detector is combined with the image source to detect "
It is necessary to cancel the "motion" Q signal component. On the other hand, if the low-pass Q signal component is used to modulate the quadrature sidebands, it can be applied continuously and does not require a motion detector.

Therefore, in a preferred embodiment, the Q signal component image is separated into a low-pass luminance signal component, a high-pass luminance signal component, and a low-pass chrominance signal component, and the low-pass luminance signal component is used as a signal component for the carrier wave in the image portion. Used for quadrature modulation, the residual 2
The signal component is inserted into the edge portion. That is, the high-pass luminance signal component is used for in-phase modulation of the carrier wave in the edge portion, and the low-pass chrominance signal component is used for its quadrature modulation. In addition,
Frequency components above the low pass band of the Q signal component color signal are not transmitted.

In an EDTV receiver, the Q signal component of the entire bandwidth is
In the still image domain, both low-pass and high-pass Q
It is recovered by recombining the signal components and is therefore used to reconstruct the scan lines that were erased from the original image signal.

In this way, a line-sequential scanned image display with maximum vertical resolution is achieved in the still image area.

On the other hand, in an NTSC receiver, only the ■ signal component of the original image is received. That is, since NTSC receivers are designed to filter out the quadrature sidebands, the low-pass Q signal component will not be detected, but the high-pass Q signal component will still be present in the edge region of the I signal component. It is hidden as
It doesn't bother the viewers. Also, if a mask signal such as a pattern in the edge region is used to hide the high-pass Q signal component, it will not be noticeable to the viewer. Instead,
The black level clamp point is changed by the insertion of the pedestal on the back porch during the horizontal retrace period, and the high-pass Q
The signal component becomes ultra-black below the black level.

The signal processing circuit of the EDTV receiver resynthesizes various signal components detected by in-phase and quadrature phase synchronous detection.
The information on the scan lines erased from the original image signal is recovered, scan conversion is performed, and the image in the image area is enlarged to meet the 16:9 aspect ratio. Also, unlike an NTSC receiver, an EDTV receiver has two video IF demodulators, one for the in-phase signal component and the other for the quadrature signal component.

Therefore, both the ■ and Q signals are obtained, and the original scanning signal is recombined by appropriate circuitry.

To provide line-sequential scan display, the horizontal scan rate of the EDTV receiver is twice that of a standard NTSC receiver, but the vertical scan rate is the same as that of a standard NTSC receiver. Although the scanning rate of the EDTV display is the same as that of the original image, the number of scanning lines included in the image of the original image signal is only 374, which is the actual number of usable scanning lines. That is, the original image signal has 120 scanning lines for the edge portion and 360 scanning lines for the image portion, whereas the display has 480 scanning lines that can be used for image display. Therefore, in order to accurately display the original image on a screen with an aspect ratio of 16:9, it is desirable to erase the edge area and expand the image area vertically. That is, the 360 scan lines of the image area would be stepped up by a ratio of 4:3 to provide the required vertical expansion to 480 scan lines, but such expansion would be dependent on the vertical filter and field. This is achieved by memory circuits.

EDTV receivers can also be used to display standard NTSC signals, and since the scan rate of a standard NTSC signal is 53 microseconds, a scan rate of 19.5 microseconds can be achieved through the use of a horizontal timebase compression circuit. Ru.

With this scanning rate, it is possible to add at least one vertical edge area to an image with an aspect ratio of 4:3 to perform the desired display. A line step-up circuit is used to step up an image of 240 scanning lines to an image of 480 scanning lines.

On the other hand, the simplification of the transmitter/receiver circuit can be achieved by relaxing the characteristics and taking economic considerations into account.
There is no need to improve color resolution beyond the amount of C. Therefore, instead of transmitting the line-to-line difference color signal component, the receiver appropriates the average color signal component between adjacent scan lines to the missing scan line. Also, according to subjective experiments, the bandwidth of the line-to-line differential signal can be reduced considerably;
Without including the high-pass filtered line difference signal in the transmitted signal,
Only the low-pass line-to-line difference signal can be used, and
For the edge region, it is also possible to dispense with transmitting the color signal component and the high-pass line-to-line difference signal, so that the edge region can be used for any other new use, e.g. for the transmission of digitized audio signals. Alternatively, the configuration of the image processing circuit can be significantly simplified.

(Example) The present invention will be described in detail below with reference to the drawings.

First, FIG. 1a shows a mode of displaying an EDTV signal according to the present invention on an NTSC receiver. The NTSC display surface 12 has an aspect ratio of 4:3, and the EDTV signal has an image portion 14 and an edge portion 16.

This image portion 14 has an aspect ratio of 16:9, and the edge portion 16 fills the NTSC display surface 12 to provide an aspect ratio of 4:3.

Next, FIG. 1b shows a mode of displaying an EDTV signal according to the present invention in an EDTV receiver. The EDTV display surface 18 has an aspect ratio of 16:9, and the EDTV display surface 18 has an aspect ratio of 16:9.
The image portion 14 of the TV signal fills the entire surface of the EDTV display surface 18, and the edge portion 16 does not appear on the IEDTV display surface 18.

Further, FIG. 1c shows a mode of displaying an NTSC signal in an EDTV receiver according to the present invention. The image portion 20 of the NTSC signal has an aspect ratio of 4:3;
[Displayed on the EDTV display screen 18 with a vertical edge portion 22.

It should be noted that although two vertical edge portions 22 and two horizontal edge portions 16 are shown in each of the above-described display configurations, in each case a single edge portion may be used if desired. You can also.

Next, FIG. 2 shows the form of a line-sequential scanning original image for an EDTV transmission system. Unlike the NTSC system that uses interlaced scanning, the EDTV system uses an original image that is line-sequentially scanned from the -L end to the bottom end, and the original image 24 is 16
An image portion 26 and an original image 24 having an aspect ratio of :9
and an edge portion 28 giving an aspect ratio of 4:3. Additionally, image portion 26 consists of 360 image scan lines and edge portion 28 consists of 120 scan lines. Note that this original image also includes a vertical retrace line portion 30 of 45 scanning lines. Image portion 26 and edge portion 2
8 is scanned in the horizontal direction with a period of 26 microseconds, and the extra 5.8 microseconds are used for the horizontal retrace portion 32. This line-sequential scanning original image 24 needs to be processed to be compatible with the NTSC standard.

Next, FIG. 3 shows the original image 24 shown in the second figure that has been processed in accordance with the NTSC standard. The processed original image 34 has an image portion 36 with an aspect ratio of 16:9 and an edge portion 38 that aligns the original image 34 with an aspect ratio of 4:3, the image portion 36 having an edge portion of 60 scan lines. Each section has 180 scanning lines, which is half the number of scanning lines of the original image 24 shown in the second figure. Further, the horizontal scanning period of the original image 34 is 52 microseconds, which is twice the horizontal scanning period of the original image 24 shown in the second diagram. Such signal processing from the original image 24 shown in the second figure to the original image 34 shown in the third figure is accomplished by line difference generation, scan conversion, and a vertical down-sampling circuit described below with reference to FIG.

FIG. 4 shows a block diagram including scan conversion and vertical down-sampling circuits for forming a main signal suitable for the original image 34 shown in FIG. Note that this main signal is
It contains only half the information originally contained in the original image 24 shown. The line difference generation circuit in Fig. 4 is
A line difference signal containing information missing from this main signal is formed. That is, the sum of the main signal and the line difference signal includes all of the information originally included in the original image 24 shown in the second diagram.

The original image 24 shown in the second figure is directed to a vertical low-pass prefilter 40 to remove undesired high-frequency signal components in the original image signal that cause aliasing distortion with subsequent vertical downsampling. The filtered output signal of the prefilter 40 is supplied to a line difference generation circuit 42. That is, the filtered output signal is led to the generation circuit 42 via line 44 and first fed to a three line period (310) delay line 46, and the output signal of the three day delay line 46 is fed to a line memory 48 and then to a line memory 48. The data is supplied to the memory 50.

At this point, image signals on three consecutive scan lines a, b and a appear at three different points 52, 54 and 5G in the circuit. That is, the image signal on the scanning line a appears at the connection point 52, the image signal on the scanning line a appears at the connection point 54,
The image signal on scan line C appears at connection point 56. Next, the image ■ signal of the scanning line a at the connection point 52 is supplied to the dividing circuit 58 to be divided into -, and the signal at the connection point 54 is
The image signal of the scanning line C of is supplied to the other dividing circuit 60.
Divide into. Next, the image signal representing half of scanning line a and the image signal representing half of scanning line C are supplied to the adding circuit 62, and the image signal of scanning line 2 at the connection point 54 is added to the image signal representing half of scanning line a and scanning line C. Subtract each - from the sum of the image signals. Therefore, the output signal of adder circuit 62 represents the difference between the image signal of scan line A and the average image signal of scan lines a and C. This line difference signal is supplied via line 64 to a scan conversion/vertical down-sampling circuit 66. Therefore, prefilter 4
The original image signal from 0 is scan-converted and vertical down-sampling circuit 6
This means that it was supplied to 6.

This circuit 66 has two channels, main channel 6
8 is used to perform scan conversion and vertical down-sampling on the original image signal, and the line difference channel 70 is used to perform scan conversion and vertical down-sampling on the line difference signal.Since both channels operate in the same way, one channel will be explained in detail only. The original image signal from the prefilter 40 is supplied to the main channel 68 via a changeover switch 72, which is a 4-point changeover switch and is connected to a line memory 74.
and 76 and 2 open points. Therefore, the image signals on every other scanning line are written to the line memory,
Furthermore, the image signals of each scanning line are written at a scanning rate of 26 microseconds. When the changeover switch 72 is at contact 1, the image signal of scanning line a is written into the line memory 74, and when the switch 72 is then switched to contact 2, the image signal of scanning line A is erased. When switch 72 is switched to contact 3, the image signal of scanning line C is written to line memory 76, and then switch 72 is switched to contact 3.
When switch 72 switches to contact 4, the image signal of scanning line d is erased, and then, when switch 72 switches to contact 1, the above-mentioned cyclic operation is started from the image signal of scanning line e. The image signal of each scanning line is read out from the line memory over a period of 52 microseconds, and when the switch 78 is switched to contact 1, the image signal of scanning line a is read out, and when the switch 78 is switched to contact 2, scanning is started. The image signal of the line C is read out, and then, when returning to the contact point l, the image signal of the scanning line e is read out, and so on. The signal from this changeover switch 78 is assumed to be one signal.

The line difference signal is subjected to scan conversion and vertical down-sampling in the same manner as the main signal. Switch 80, line memory 8
2 and 84 and switch 86 operate in conjunction to form a line-to-line difference signal having a scan time of 52 microseconds per scan line, and also to cancel every other scan line.
In the line-to-line difference channel, scan lines that are reserved in the main channel are erased. This line difference signal is referred to as a Q signal.

A block diagram of the premodulator elements in the EDTV broadcast signal transmission system is shown in FIG. Each component in FIG. 5 is provided to encode and insert a part of the Q signal into the edge area of the signal.
Since the size of the Q signal is only 73, it takes a complete vertical scan :) frame to include the information of the image part of the Q signal in the edge part of one signal, and therefore the Q signal is
It will appear only once per vertical scan. For this reason, a motion detector is provided to detect motion of the Q signal,
When a movement of the image is detected, the corresponding part of the Q signal is made blank. A time-base compression and multiplexing circuit is also provided for the chrominance signal component of the Q signal so that the chrominance signal component can be located in the edge region of the luminance signal component in the Q signal. Furthermore, since the edge area is only 173 times the size of the image area, these color signal components are also processed by the motion detector circuit. In addition, ■signal and Q
In order to perform compensation in the processing of each signal component of the signal,
Various delay compensation circuits are provided.

The Q signal is separated into a luminance signal component y and chrominance signal components u and v, and the chrominance signal components u and v are supplied from the circuit shown in FIG. Band limiting, the luminance signal component y is fed to a low pass filter 90 to limit the band to 0-1.25 MHz.

Then, the low-pass filtered output color signal component is sent to a motion detector 92.
and supplies the low-pass filtered output luminance signal component to a subtractor 91 which also supplies the luminance signal component itself. The high-pass filtered luminance signal component output from the subtractor 91 is also supplied to the motion detector 92 . Upon detecting image motion in these signal components, motion detector 92 forms a motion signal indicative of the image motion. This motion signal controls switch 94 to blank the luminance/color name filtered output signal components so that those filtered output signal components are removed from further signal processing. When no movement of the image is detected by the motion detector 92, the luminance/color name signal component is 60
A field memory 96 is provided which can store information for a scan line. Next, the brightness signal component of the Q signal is added to the adder circuit 9.
8, and the output of the pattern generator 100 is also fed to the adder circuit 98. Note that the addition circuit 98 and the pattern generator 100 supply the backband shown at the edge portion of the displayed image in order to prevent the viewer's attention from straying from the Q signal encoded at the edge portion of the image. . The summation output of summing circuit 98 is then applied to switch 102 to control the supply of the summation output to in-phase modulator 104.

On the other hand, the delay compensation circuit 10
6 to the switch 102. Here, period A
Let be the period during which the image part of the original image is sent to the modulator,
Assuming that period B is the period in which the edge portion of the original image is sent to the modulator, the changeover switch 102 sends the signal component to the in-phase modulator during the 180 scanning line period connected to contact A corresponding to period A. 104. In addition, a total of six changeover switches 102 are connected to contact points corresponding to the period.
During the 0 scan line period, the high pass filtered output luminance signal component of the Q signal and the pattern signal are provided to the in-phase modulator 104.

Further, the color signal component of the ■ signal is supplied to the color encoder 108, and then combined with the luminance signal component of the output signal in the adder circuit 110 before being supplied to the in-phase modulator 104. Further, the sum of the high-pass filtered output component of the Q signal and the pattern signal is supplied to the in-phase modulator 104 via the adder circuit 98 .

On the other hand, the low-pass filtered output component of the Q signal is supplied from the field memory 96 to the time compensation/multiplexing circuit 112 for time compensation and multiplexing, and then the color signal component of the Q signal is sent to the contact point of the switch 114. B, and its contact B is activated during the 60 scan line period of edge portion transmission. On the other hand, the low-pass filter output luminance signal component of the Q signal is passed through the low-pass filter 90.
is supplied to the delay compensation circuit 116, and then to the contact A of the changeover switch 114, and the switch 114
The luminance signal component of the Q signal is supplied to the quadrature modulator 118 only during the period when the Q signal is connected to the quadrature modulator 118.

Therefore, the circuit configuration shown in FIG. 5 provides a means for placing a part of the Q signal in the edge region of the signal.
Further, the color signal component of the Q signal is placed in the edge region of the luminance signal component of the Q signal. Furthermore, when the motion detector detects the motion of the image, it blanks out the portion placed in the edge region of the Q signal.

Further, both I and Q signals are transmitted after modulating carrier waves, and are received by a television receiver.

Next, FIG. 6 shows a block diagram of the RF, IF and detection parts of the EDTV receiver. These circuit portions include an additional I which processes the received quadrature signal components.
Except for the F amplifier and its associated circuitry, it operates similarly to that in an NTSC receiver. First, the transmitted signal is received by the antenna 120 of the receiver, and then the antenna 1
20 to tuner 122, then tuner 1
22 provides the signal to an audio IF amplifier 124, an in-phase IP amplifier 126, and a quadrature-phase IF amplifier 128. A synchronization signal obtained by supplying the signal from the in-phase IP amplifier 126 to the phase-locked loop oscillator 130 is supplied to an audio synchronous detector 132 , an in-phase synchronous detector 134 , and a quadrature-phase synchronous detector 136 .

The in-phase synchronous detector 134 supplies the in-phase signal component to the I signal demodulator 138, and the quadrature-phase synchronous detector 136 supplies the quadrature-phase signal component to the Q signal demodulator 140.

The demodulated output signal is then supplied to other signal processing circuits of the EDTV receiver.

Next, FIG. 7 is a block diagram of each signal processing circuit in the EDTV receiver, and these signal processing circuits are as follows:
(2) Accumulate the information detected from the original signal in the Q signal to form the signal. Of these, FIG. 7a shows a circuit arrangement for reconfiguring both the I and Q signals, and FIG. 7b shows a circuit arrangement for combining both the ■ and Q signals to produce a signal suitable for display. In FIG. 7a, the signals from the in-phase and quadrature flank tuners are gated in time by the same switching control as shown in FIG.
The in-phase signal component is transferred to the comb filter 142 and the color demodulator 14.
4 to form the I signal. In addition, the period A
The signal obtained from the quadrature phase detector in is a line-to-line difference signal component of the low-pass filtered output luminance signal, and the signal component is supplied to the adder circuit 146 to calculate the line-to-line difference signal component of the high-pass filtered output luminance signal. Add to the difference signal component. On the other hand, during the period, the high-pass filtered output luminance signal component of the Y signal is supplied from the high-pass filter 150 to the field memory 148 to update the luminance portion of the image. Also, during period A, the entire field memory is read out to provide the complete luminance signal component of the Q signal, and the Q signal is further read out and provided to the time base extension/separation circuit 152.

As a result, the Q signal is recombined in place in the image.

On the other hand, when receiving an NTSC signal on an EDTV receiver,
Leave the changeover switch 154 connected to contact A so that the ■ signal becomes a normal NTSC signal component. Note that in this case, the Q signal does not appear. In this case, shown in FIG. 7b, the {circle around (2)} signal goes directly to scan converter 156, and the scan line information lost during line-sequential scan signal generation is provided by interpolation filter circuit 158. Note that decision logic determines whether the interpolation is performed using information on adjacent scanning lines or information on the previous field. Furthermore, the scan converter 156 uses the time axis compression signal from the clock controller 160 to compress the horizontal time axis of the signal.

[When receiving the EDTV signal on the EDTV receiver, both the ■ and Q signals are sent to the field memories 162 and 16.
3 and vertical filters 164 and 165. Further, an adjacent line averaging circuit 166 consisting of an l-line delay line 224, a 1/2 divider 232, 234, and an adding circuit 236 supplies an image signal averaged between adjacent scanning lines to an adding circuit 168, and subtracts it from the Q signal. , which originally forms the image information of the scan lines missing from the original image. Furthermore, since the scan converter 156 does not perform horizontal time axis compression in this case, the image is expanded to fill the entire width of the screen.

Next, FIG. 8a shows the field memory 162 shown in FIG. 7b. 163 and vertical filter 164.16
An example of the configuration of No. 5 is shown below. Note that the field memory and vertical filter have the same configuration for both the ■ and Q signals. The circuit configuration shown provides a means for expanding three scan lines of the input signal into four scan lines of the output signal, and each group of three input scan lines is averaged with gradual changes between each group. do. The input signal is ■.

Any Q signal is gated by changeover switch 184 during the image period of that signal to alternately supply odd field memo 86 and even field memo 88. While some fields are being written via switch 184, other fields are being written via switch 190.
The readout of that field memory is
Control is performed so that one image scanning line signal is completed when three image scanning lines are read out.

The image scan line signal is transmitted through one line delay lines 194 and 196.
and are supplied sequentially.

When three scan lines are applied in sequence, the first scan line signal X appears at node 198 and the second scan line signal Y appears at node 200.
, and a third scan line signal Z appears at the connection point 202. Among these three scanning line signals, the scanning line signal X has 174
The X/4 signal is supplied to the dividing circuit 204 and added to the adding circuit 2.
06 and 208, and the scanning line signal Y is supplied to the 374 division circuit 210, the 1/2 division circuit 212 and the first contact of the circulation changeover switch 214, and
The 3/4 Y signal from 0 is supplied to the adder circuit 206 and added to the above-mentioned X/4 signal to form a signal equal to 3/4 Y + X/4, which is supplied to contact 2 of the changeover switch 214 . Further, the Y/2 signal from the dividing circuit 212 is supplied to the adding circuit 216.

Furthermore, the scan line signal Z is supplied to a 374 division circuit 218 and a 172 division circuit 220, and a 3/4z signal is supplied to an adder circuit 208, which adds it to the above-mentioned X/4 signal and converts it into 3
A signal equal to /4 Z +
A signal equal to /2 + X/2 is formed and supplied to contact 3 of the changeover switch 214. The circulation changeover switch 214 then switches each contact 1. 2. 3 and 4 are sequentially applied to output 222 and further processed by the remaining circuitry shown in FIG. 7b.

Next, in order to facilitate understanding of the operation of the vertical filter 164 or 165, each connection point 19 is shown in FIG.
8. Shows scan line signals X, Y and 2 appearing at 200 and 202 respectively. At time point 1, image scan line a is read from even field memory 188 and connected to connection point 1.
At time point 2, image scanning line a is read out and supplied as signal X to connection point 198, and image scanning line a is read out and supplied to connection point 200 as signal Y. , the image scanning line C is read out and supplied to the connection point 198 as a signal 202 as signal 2. Thus, as a new image scan line is applied to connection point 198, the previous image scan line is applied to the next connection point in sequence. It should be noted that each image scan line d, h, and β shown with diagonal shading is a blank scan line and passes through the illustrated circuit in the same way as the image scan line from the other field memory.

As described above, the signal appearing at contact 1 of circulation changeover switch 214 is Y, and the signal appearing at contact 2 is 3/
4 Y + X/4, and the signal appearing at contact 3 is Y
/2 + X/2, and the signal appearing at contact 4 is 3/2
4 Z + X/4. This circulation changeover switch 2
14 operates synchronously, so when it is at contact 1,
At connection point 200, an image scan line immediately following the blank scan line appears. Further, in FIG. 8b, at time point 6, the output terminal 222
The signal appearing at is image scan line e, and the output signal at time 7 is 374 of image scan line f and 1 of image scan line g.
74, the output signal at time 8 represents the sum of 172 of image scan line f and 172 of image scan line g, and the output signal at time 9 represents the sum of 3/4 of image scan line g.
and 174 of image scanning line i. Furthermore, time point 1
At 0, the cycle returns to the starting point of the cycle described above and the output signal becomes image scan line i. Also, there is no point in time when a blank image scan line appears at the in/out edge 222. In this manner, vertical filter 164 and field memory 162 expand groups of input three image scan lines into groups of output four image scan lines with gradual changes between groups.

Next, FIG. 9 shows a block diagram of a simplified EDTV image transmitting device. Each block shown operates similarly to the same block shown in FIG. The color signal component of the Q signal is erased prior to transmission, and its edge region is not used for transmission of the luminance signal component of the Q signal. On the other hand, ■
The color signal component of the signal is sequentially supplied to a color encoder 170 and an adder circuit 172, and the luminance signal component is directly supplied to an adder circuit 172.
The summed output of is supplied to an in-phase modulator 174. Also,
The luminance signal component of the Q signal is supplied to a low pass filter 176 with a band of 0 to 1.25 MHz, and a low pass filtered output luminance signal component is supplied to a quadrature phase modulator 178 .

Thus, vertical color resolution does not need to be improved beyond the amount in standard NTSC systems since visual perception cannot distinguish minute changes in color. Therefore, the illustrated circuit configuration shows how the circuit configuration shown in FIG. 5 can be significantly simplified.

Next, FIG. 10 shows a block diagram of a simplified EDTV receiver. Each block shown operates in the same manner as shown in FIG. 7, but if the signal processed and simplified by the circuit configuration shown in FIG. The signal is separated into a luminance signal component and a color signal component, and then the color signal component is supplied to a color demodulator 182 to form a complete black signal. (2) Since there is no Q signal component present in the signal, the luminance signal component of the Q signal can be fed directly to the remaining circuitry of the receiver without further processing. Therefore, the circuit configuration of the EDTV receiver can be significantly simplified.

(Effects of the Invention) As is clear from the above description, according to the present invention, extended definition television (EDTV) signals can be converted into standard NTSC signals.
EDTV signals can be formed, transmitted, received, and displayed within the bandwidth of the EDT
A special advantage is that it can be received and displayed by an NTSC receiver as well as by a V receiver, and standard NTSC signals can be received and displayed by an EDTV receiver.

Although the present invention has been described above with reference to particularly preferred embodiments, this embodiment is not intended to limit the present invention in any way, and the present invention may be modified, modified, or modified in any way without departing from the gist thereof. Similar implementations can be made with substitutions.

[Brief explanation of the drawing]

FIG. 1a is a diagram showing a mode of displaying an EDTV signal of the present invention by an NTSC receiver, FIG. 1b is a diagram showing a mode of displaying an EDTV signal of the present invention by an EDTV receiver, and FIG. 1c is a diagram showing a mode of displaying an EDTV signal of the present invention by an EDTV receiver. FIG. 2 is a diagram showing the form of a line progressive scan original image for EDTV signals; FIG. 3 is an NTSC compatible signal as a result of processing the original image shown in FIG. 2 according to the present invention. A line diagram showing the form of , Figure 4 is ■・
FIG. 5 is a block diagram showing an example of the configuration of a Q signal generation circuit. FIG. 5 is a block diagram showing an example of the configuration of a premodulator for an EDTV broadcast signal transmission system. FIG. 6 is a block diagram showing an example of the configuration of a premodulator for an EDTV broadcast signal transmission system. FIG. 7a and 7b are block diagrams showing an example of the configuration of each signal processing circuit of an EDTV receiver, and FIG. 8a is a block diagram showing an example of the configuration of each part of the signal processing circuit of the EDTV receiver. A block diagram showing an example of the configuration of each part of the vertical filter, FIG. 8b is a diagram showing the mode of operation of the vertical filter section in the configuration example shown in FIG. 7, and FIG. 9 is a block diagram showing an example of the configuration of a simplified EDTV image transmitter. Diagram: FIG. 10 is a block diagram showing an example of the configuration of a simplified EDTV receiver. 12・EDTV display surface 14.20.26.36
...Image portion 16, 28.38--Horizontal edge portion 18
・EDTV display surface 30...Vertical return line portion 32・
...Horizontal retrace section 40...Vertical low-pass prefilter 44, 64...Line 46...3H delay line 48, 50.74.76, 82.84...Line memory 52, 54 .56.198.200.202...
・Connection point 58, 60.204.210.212.218
．． 220...Division circuit 62, 98.110.146.
168.206.208.216.236...Addition circuit 66...Scan conversion/vertical down-sampling circuit 68...Main channel 70...Line difference channels 72, 7
8.80.86.94.102.114.154.18
4.190°214...Switch 88, 90.176...Low pass filter 91...Difference circuit 92...Motion detector 96, 148
．． 162. 186. 188...Field memory 100...Pattern generator 104...In-phase modulator 106, 116...Delay compensation circuit 108, 170...Color encoder 112...
Time axis compression multiplexing circuit 118...Quadrature phase modulator...Antenna 122...Chenna...Audio IF amplifier 126...In-phase IF amplifier...Quadrature phase IP amplifier...Phase-locked loop oscillator ...Audio synchronous detector 134...In-phase synchronous detector・
... Quadrature phase synchronous detector ... I signal demodulator 140 ... Q signal demodulator 18
0... Comb filter 182... Color demodulator 150... High pass filter... Time axis expansion separation circuit... Scan conversion section 158... Interpolation filter section
...Black 7 controller 164...Vertical filter...
Adjacent line averaging circuit 196...1 line delay line

Claims (1)

[Claims] 1. A television system that transmits and receives at least an extended definition television (EDTV) broadcast signal using an NTSC channel bandwidth, comprising: an image portion having an aspect ratio of at least 16:9; forming means for forming an EDTV signal exhibiting a lateral edge portion adjacent to the image that brings the overall aspect ratio of the image to 4:3;
A standard NTSC receiver receives the EDTV signal and displays it as a 4:3 image that includes a 16:9 image and at least one side edge to fill a 4:3 aspect ratio screen. a receiving means for receiving at least the transmitted EDTV signal; and a receiving means for displaying a television image with an aspect ratio of 16:9.
display means having a 6:9 screen; and at least the received
Enlarging means for enlarging an image of a DTV signal in the horizontal and vertical directions and forming an enlarged output signal corresponding to the enlarged image, wherein the display means receives the enlarged output signal and displays the at least one An EDTV system characterized in that only an enlarged 16:9 image is displayed on the screen without any side edges. 2. The transmitting means includes means for transmitting an NTSC broadcast signal in a standard aspect ratio of 4:3, and the receiving means receives the NTSC broadcast signal and transmits the NTSC broadcast signal in the form of a standard aspect ratio of 4:3.
EDTV according to claim 1, characterized in that the EDTV is provided with means for displaying on a 6:9 screen together with at least one vertical edge portion so as to fill the screen.
method. 3. Encoding means for encoding a portion constituting the at least one vertical edge portion of the EDTV signal together with information corresponding to an image; and decoding for decoding the vertical edge portion of the received EDTV signal to form enlarged image information. 2. The EDTV system according to claim 1, further comprising means for displaying said enlarged image information on said screen as part of an image in said receiving means. 4. Means for expanding the image in the horizontal direction by composing the image by a large number of scanning lines and having the enlarging means scan each scanning line of the image beyond the horizontal width of the screen. EDTV system according to claim 1, characterized in that the EDTV system comprises: 5. Enlarging the image in the vertical direction by composing the image with a large number of scanning lines and adding one extra scanning line to the enlarging means for each specific number of scanning lines of the image; The EDTV system according to claim 1, further comprising: means. 6. Means for expanding the image in the horizontal direction by composing the image by a large number of scanning lines and having the enlarging means scan each scanning line of the image beyond the horizontal width of the screen. , and means for vertically enlarging the image by adding one extra scan line for every specified number of scan lines of the image. EDTV method. 7. means for expanding the image in the horizontal direction by configuring the image with a large number of scanning lines and scanning each scanning line of the image beyond the horizontal width of the screen; scanning the image; means for vertically enlarging said image by adding one extra scan line for every specified number of lines; and filtering the scan lines of said image including the extra scan lines added by said enlarging means. 2. A filter according to claim 1, further comprising filtering means for substantially eliminating image distortion in the vicinity of said extra scan lines of said image by forming a smooth image. EDTV method. 8. The image is composed of a large number of scanning lines, and the enlarging means receives the EDTV signal, and includes three scanning lines of the EDTV signal and one scanning line for every three scanning lines of the received EDTV signal. an input means for forming an output signal consisting of a blank scanning line of a book, and receiving the output signal from the input means, and applying a load between every third scanning line and the blank scanning line formed by the input means; 2. The EDTV system according to claim 1, further comprising output means for forming four scanning lines by combining. 9. The output means is configured to output X, Y and Z as three successive scan lines received by the output means formed by the input means: Y, 3/4Y+1/4X, 1/2Y+1/2Z and 3/4Z+1/ 9. The EDTV system according to claim 8, characterized in that four scanning lines of 4X are formed. 10. At least extended definition television (EDTV)
In a television system for transmitting and receiving signals, a forming means for forming an EDTV signal comprising an entire image having at least an image portion and at least one lateral edge portion adjacent to the image portion; and the lateral edge portion. encoding means for encoding the image along with information corresponding to the image portion to form an encoded EDTV signal; transmitting means for transmitting at least the encoded EDTV signal; receiving means for receiving at least the encoded EDTV signal; The display means having a screen for displaying a television image, and the decoding means for decoding the received EDTV signal to form image information and enlarged image information, thereby displaying the image information and the enlarged image information. An EDTV system characterized in that parts of the same image are displayed on the screen. 11. The forming means includes means for scanning the entire image line-sequentially to form a scanning image made up of image scanning lines, and forming an I signal and a Q signal so that every other image scanning line is added to the I signal. and the Q signal corresponds to the remaining image scan lines, and the I signal and the Q signal are
each having an image portion and an edge portion, and having the encoding means encode the edge portion of the I signal together with information from the image portion of the Q signal to produce an encoded I signal. and means for encoding an edge portion of the Q signal together with information from an image portion of the Q signal to form an encoded Q signal. 11. The EDTV system according to claim 10, wherein the Q signal at least partially constitutes a coded EDTV signal for transmission. 12. Regarding the Q-signal image having a luminance component and a color component, bandpass filtering the luminance component and color component of the Q-signal image to form at least high- and low-frequency luminance components and low-frequency color components. means for encoding an edge portion of the I signal together with the high-band luminance component of the Q signal to form a coded I signal; A patent claim characterized by comprising an encoding means for encoding together with the gamut color components and encoding an image portion of the Q signal together with the low-range luminance component of the Q signal to form an encoded Q signal. EDTV system according to item 11. 13. With respect to the image portion of the Q signal having a luminance component and a color component, the above-mentioned method includes a filtering means for filtering the luminance component of the Q signal image to form a low-frequency luminance component, and a means for forming a carrier wave signal. The transmitting means includes modulating means for modulating the in-phase component of the carrier wave signal by the I signal, and modulating means for modulating the orthogonal component of the carrier wave signal by the low-band luminance component of the Q signal, and the receiving means includes: , demodulating means for demodulating the in-phase component of the carrier signal to reproduce the I signal; and demodulating means for demodulating the orthogonal component of the carrier signal to reproduce the low-band luminance component of the Q signal. 12. The EDTV system according to claim 11, further comprising means for synthesizing the I signal and the low-range luminance component of the Q signal in the demodulating means to form image information. . 14. In an extended definition television (EDTV) system comprising transmitting means for transmitting a broadcast signal having in-phase and quadrature components and receiving means for receiving the broadcast signal using an NTSC channel bandwidth, certain An image forming means for forming an original image consisting of an image portion having an aspect ratio and an edge portion having dimensions to have an aspect ratio compatible with NTSC broadcasting; scanning means for forming a scanning image consisting of; a selection means for selecting every other horizontal scanning image scanning line to form a main scanning signal having an image portion and an edge portion; and every other image scanning line and at least one adjacent image scanning line; and a differential circuit that generates a differential scanning signal corresponding to the difference between the scanning line and at least one adjacent image scanning line, and inserting a first portion of the differential scanning signal into the edge portion of the main scanning signal to generate a modified main scanning signal. a quadrature modulator for modulating a second portion of the differential scanning signal into an orthogonal component of the broadcast signal; and an in-phase modulator for modulating the modified main scanning signal into an in-phase component of the broadcast signal. a modulator; an in-phase demodulator in the receiving means for demodulating the in-phase component of the broadcast signal to reproduce the modified main scanning signal; and an in-phase demodulator for demodulating the orthogonal component of the broadcast signal to reproduce the modified main scanning signal. a quadrature demodulator in the receiving means for reproducing the second portion; and extracting the first portion of the differential scanning signal from the edge portion of the modified main scanning signal to reproduce the main scanning signal and the differential scanning signal. extracting means for reproducing the first portion of the differential scanning signal; combining means for synthesizing the first portion of the differential scanning signal with the second portion to reproduce the differential scanning signal; and combining the main scanning signal and the differential scanning signal. reconstruction means for reconstructing the scanned image from the scanned image; an enlargement circuit for enlarging the scanned image to form an enlarged image having the specific aspect ratio by enlarging the image portion; and compensation for the enlargement of the scanned image. An EDTV system characterized by comprising: a vertical filter that performs the following: and a display unit that displays the enlarged image at the specific aspect ratio. 15. A patent comprising: a motion detector for forming a motion signal to indicate the motion of the image; and means for pausing the inserting means such that the motion signal indicates the motion of the image. EDTV system according to claim 14. 16. Claim 1, characterized in that the difference circuit generates a difference between the average signal of two image scanning lines separated from each other by one image scanning line and the one image scanning line. EDTV method described in Section 14. 17. An apparatus comprising a magnifier and a vertical filter for use in a television receiver to vertically enlarge a television image comprising a number of input image scan lines, the apparatus receiving the input image scan lines and transmitting the input image to the apparatus. An output signal consisting of N image scan lines is formed for each group of M input image scan lines, and each of the N image scan lines is A vertical expansion filtering device comprising means for taking a weighted average of the M image scanning lines. 18. An input for receiving a television image signal to form an output signal consisting of N image scan lines and at least one blank image scan line for every M image scan lines in the received television image signal. means for receiving the output signal from the input means to form N output scan lines consisting of a weighted average of the M image scan lines formed by the input means, where M and N are 18. The vertical expansion filtering device according to claim 17, further comprising output means configured to have a numerical value equal to the sum of M and the number of blank image scanning lines. 19, where X, Y, and Z are three consecutive input image scan lines received by the device, Y, 3/4Y + 1/4X, 1/2Y
18. The vertical expansion filtering device of claim 17, wherein the device forms four output image scan lines consisting of +1/2Z and 3/4Z+1/4X. 20. A first dividing circuit that generates an output signal consisting of 1/4 of the input signal, a second dividing circuit that generates an output signal consisting of 3/4 of the input signal, and an output signal consisting of 3/4 of the input signal. a third dividing circuit that generates an output signal consisting of 1/2 of the input signal; a fifth dividing circuit that generates an output signal consisting of 1/2 of the input signal; a first one-line delay line for delaying the input signal by a time sufficient to read one image scan line; and a second one-line delay line for delaying the input signal for a sufficient time to read one image scan line. , a first adder circuit, a second adder circuit, a third adder circuit, changeover switch means having first, second, third and fourth terminals, each said division circuit, each said one line delay. circuit means for interconnecting a line and each of the adder circuits, supplying the X image scan line to the first line delay line and the first dividing circuit, and supplying the Y image scan line to the first
- Supplying the Z image scanning line from the 1st line delay line to the 2nd/1st line delay line, the 2nd division circuit, the 4th division circuit, and the first terminal of the changeover switch means, and connect the Z image scanning line to the 2nd/1st line delay line. to the third dividing circuit and the fifth dividing circuit, and supplying the output of the first dividing circuit and the output of the second dividing circuit to the first adding circuit to generate the 3/4Y+1/4X. The 1/2Y+1/2Z generated by supplying an image scanning line to the second terminal of the changeover switch means and supplying the output of the fourth division circuit and the output of the fifth division circuit to the second addition circuit. The image scanning line is supplied to the third terminal of the changeover switch means, and the output of the first division circuit and the output of the third division circuit are supplied to the third addition circuit to generate the 3/4Z+1/4X. supplying an image scanning line to a fourth terminal of said changeover switch means, said changeover switch means supplying a line from said first terminal to said second terminal;
The terminal, the third terminal, the fourth terminal, and return to the first terminal, and the output of the changeover switch means is sequentially Y, 3/4X+1/4Y, 1/2Y+1/2Z.
and 3/4Z+1/4X, the vertical expansion filtering device according to claim 19. 21. In a television system having information encoded in the edge portion of a television image having an image portion and an edge portion, means for encoding information in the edge portion of the television image, and a mask signal. a multiplexer for multiplexing the mask signal and the edge portion containing encoded information to form a multiplexed edge portion; and a multiplexer for multiplexing the image portion and the multiplexed edge portion as a transmission signal. a receiver for receiving the transmitted signal; a demultiplexer in the receiver for separating the mask signal and the edge portion containing encoded information; and a demultiplexer for decoding the edge portion. A television system characterized by comprising means in a receiver. 22, an image portion both encoded by information and at least one image portion adjacent to the image portion constituting the entire image;
A television receiver for receiving at least an encoded television signal having a horizontal edge portion comprising: receiving means for receiving at least said encoded television signal; said image portion of said received encoded television signal; and said image portion of said received encoded television signal; A television receiver comprising: decoding means for decoding a side edge portion to form image information and enlarged information; and output means for outputting the image information and the enlarged information. 23. The enlarged information is enlarged image information, and the output means includes display means having a screen for displaying the image information and the enlarged image information as parts of the same image. The television receiver according to item 22. 24. At least in a method of encoding a television broadcast signal using a standard channel bandwidth, at least an image portion with an aspect ratio of 16:9 and an entire image with an aspect ratio of 4:3 are constructed adjacent to the image portion; forming a television signal having at least one lateral edge portion that fills a screen with a 4:3 aspect ratio; receiving and displaying the television signal as a 4:3 screen image including a 16:9 image along with a side edge portion. 25. A method for encoding at least a television signal, comprising: forming a television signal having at least an image portion and at least one lateral edge portion constituting the entire image adjacent to the image portion; encoding said lateral edge portion together with information corresponding to the image portion to form a coded television signal. 26. A television encoding method comprising the step of encoding a television broadcast signal having an in-phase component and a quadrature component using a standard channel bandwidth, the method comprising: encoding a television broadcast signal having an in-phase component and a quadrature component; a step of forming an original image having a horizontal edge portion having a dimension that gives an aspect ratio of 1, a step of scanning the original image line-by-line to form a scanned image consisting of a large number of horizontally scanned image scan lines; alternatingly selecting image scan lines to form a main scan signal having an image portion and a side edge portion; and a differential scan signal corresponding to a difference between every other image scan line and at least one adjacent image scan line. forming a modified main scanning signal by inserting a first portion of the differential scanning signal into a horizontal edge portion of the main scanning signal; and inserting a first portion of the differential scanning signal into the horizontal edge portion of the main scanning signal; A television encoding method comprising: modulating the modified main scanning signal with an orthogonal component of the signal; and modulating the modified main scanning signal with an in-phase component of the television broadcast signal. 27. A method for encoding a television signal having information encoded in the edge portion of a television picture having an image portion and an edge portion, comprising: encoding information in the edge portion of said television image to form a mask signal; and multiplexing the mask signal and the edge portion containing encoded information and forming a multiplexed edge portion. 28. In an apparatus for decoding a television broadcast signal having at least an image portion with an aspect ratio of 16:9 and at least one lateral edge portion adjacent to the image portion constituting an entire image with an aspect ratio of 4:3. , when the television broadcast signal is received, at least an image portion of the received signal is expanded in both horizontal and vertical directions to form an enlarged image with an enlarged dimension and an aspect ratio of 16:9;
A decoding device comprising an enlarging means for forming an enlarged output signal corresponding to the enlarged image. 29. An apparatus for decoding a television broadcast signal having at least an in-phase component and a quadrature component, wherein every other image scanning line, an image portion having a specific aspect ratio, and the main scanning signal are compatible with standard television broadcasting. A modified main scanning signal having a first portion of a differential scanning signal corresponding to a difference between at least one adjacent image scanning line inserted into an edge portion of an interlaced main scanning signal consisting of an edge portion having a dimension giving an aspect ratio of an in-phase demodulator that demodulates an in-phase component of the television broadcast signal for reproducing a signal; a quadrature demodulator that demodulates a quadrature component of the television broadcast signal to reproduce a second portion of the differential scanning signal; means for extracting a first portion of a scanning signal from an edge portion of the modified main scanning signal to reproduce the main scanning signal and the first portion of the differential scanning signal; means for reproducing the differential scanning signal by combining with the main scanning signal and the differential scanning signal; means for reconstructing the line sequential scanning image from the main scanning signal and the differential scanning signal; and enlarging the image portion by enlarging the line sequential scanning image. A decoding device comprising: an enlargement circuit that forms an enlarged image having the specific aspect ratio; and a vertical filter that compensates for the enlargement of the scanned image. 30. A device for decoding a television signal in which a mask signal is multiplexed on the edge portion containing encoded information of a television image having an image portion and an edge portion, the edge portion including the mask signal and encoded information. A decoding device comprising: a demultiplexer that separates the edge portion; and means for decoding the edge portion.